gpg-auth: Fix use after free.

* tools/gpg-auth.c (ssh_authorized_keys): Move free after printing error
message.

This is part of
(cherry picked from commit 9adaa79ab43e2f87178b8ee5ab1a353cba384606)

• Signed-off-by: Jakub Jelen <jjelen@redhat.com>
• GnuPG-bug-id: T7129